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Measurement and Instrumentation

Measurement and Instrumentation
A spring controlled indicating instrument has a deflection of 90deg for maximum current I. The corresponding deflection for a gravity controlled instrument is

120°
0°
30°
90°

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Measurement and Instrumentation
Which of the following are integrating instruments?

Voltmeters
Ammeters
Ampere hour and watt hour meters
Wattmeters

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Measurement and Instrumentation
Wagner earthing device is used to eliminate errors due to

Both A and B
Electromagnetic coupling
Electrostatic coupling
None of these

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Measurement and Instrumentation
A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

 25 W.
 100 W.
 50 W.
  0 W.

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Measurement and Instrumentation
The moving coil-meters, damping is provided by

 damping vane in the airtight chamber.
 the coil spring attached to the moving.
 the aluminium frame of the coil.
 eddy current disk.

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Measurement and Instrumentation
The internal resistance of Weston standard cell is of order of

 10 ohm.
 1 ohm.
 1000 ohm.
 100 ohm.

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